Information security itself covers a wide range, ranging from the security of national military and political secrets. The smaller scope also includes, of course, preventing the leakage of commercial enterprise secrets, preventing teenagers from browsing harmful information, and the leakage of personal information. wait. The information security system in the network environment is the key to ensuring information security, including computer security operating systems, various security protocols, security mechanisms (digital signatures, information authentication, data encryption, etc.), up to the security system, any security vulnerability in it can Threaten global security. Information security services should at least include the basic theory supporting information network security services, as well as the network security service architecture based on the new generation of information network architecture.

Information security means that the hardware, software and data in the system of the information network are protected from being damaged, altered or leaked by accidental or malicious reasons, and that the system operates continuously, reliably and normally. Information services will not be interrupted.

Information security is a comprehensive discipline involving computer science, network technology, communication technology, cryptography technology, information security technology, applied mathematics, number theory, information theory and other disciplines.

In a broad sense, all related technologies and theories involving the confidentiality, integrity, availability, authenticity and controllability of information on the network are the research fields of network security.